Queries with the "Last edit: Flagged" do not work as expected.

For example, a query to search in Russian wikipedia in category "Вариационное исчисление" finds all 26 articles.
The same query with "Last edit: Flagged=Yes" finds 21 articles.
I would expect that this query with "Last edit: Flagged=No" finds remaining 26-1=5 articles that have not been reviewed. But it finds only 1 article that have been reviewed. Deep Out Of Sight finds the remaing 4 unreviewed articles

I would expect that query with 'Flagged=Yes' would wind 22 articles (21+1 from results above) and with 'Flagged=No' would wind 4 articles (the result of Deep Out Of Sight).